Electric furnace.



F. SARTORI.

ELECTRIC FURNACE. APPLICATION FILED AUG.19, 1910.

Patented May 30, 1911.

WITNESSES 7% 7% A 'r'romuey around the whole circumference, or onlypartly around theclrcumference, such as the provided with pivot pins 7mounted on Application filed August 15,

To all whom it may concern:

Be it known that l, Francesco Siinronr, a subject of the King of Italy,residing at Monteponi, Sardinia, Italy, have invented a certain new anduseful Improved Electric Furnace, of which the following is aspecification.

This invention relates to a typeof electric resistance furnace in whichthe muflie intended to contain the material to be treated, is closed atone of its ends and mounted so as to be able to assume the verticalposition with the open end facing upward when it is desired to introducea charge, a horizon tal or almost horizontal position during thetreatment, and the vertical position with the opening downward, fordischarging the Ina-- terial.

A construction of the furnace according to this invention, speciallyadapted for the treatment of zinc ores, is illustrated by way of examplein theaccompanying drawing.

As shown on the drawing, the mufliehas a shape similar to that of theniufiies used in zinc metallurgy, but it is formed of a refractorymaterial which is a bad conductor of electricity, such as refractorymixtures of clay, coke or graphite, so,t hat it is possible to heat itup to 12004300? C. by an electric current supplied by electrodes '2, 2.The mulile 1 is arranged in a cylindrical sheet metal receptacle 3closed at one end, and between the wall of the muffle 1 and the sheetmetal receptacle, there is a refractory lining 5 formed of severallayers of non conducting material 6 or air chambers.

The sheet metal receptacle 3 with its refractory. lining can beeXtended, at its open end beyond the mouth of the rnufile, eitherportion iprojectnigib'eyond the mouth of the mufile and provided with amovable cover 11. In any case, the receptacle 3 is bearings 8, so asto'be able to rotate thereon, By nr'eansof aworm wheel secured to one ofthe'said pivots 7, and of a worm mounted on the corresponding bracket orbearing 8, or in any other suitable manner, the rotation of the furnacecan be easily eflected.

rarnn'r onerou- 291%, Serial No. 578,044.

The charging of the furnace is effected by bringing it into the verticalposition with the open end upward and by introducing into the hopper 9the material to be treated, such as calcined calamine, roasted blends orother ores or lay-products mixed with poor coal. When the charging iscompleted, the receptacle is brought into practically a horizontal.position, and a condenser is applied. to the mouth of the muliie forcollecting the Zinc, Finally, the cover 11 is put on and thus forms ahot chamber around the condenser. A plate of refractory materialsupports the front portion of the condenser and prevents radiation. Itis preferable to provide the condenser with an extension 13. idhen theprocess is completed, the cover 11, the condenser 16 and the plate 12are removed, whereupon, by means of the worm, the furnace is broughtinto tie vertical position with the open end downward, and the residuesof the distillation are discharged through an opening 14: provided belowthe apparatus.

What I claim as my invention and desire to secure by Letters Patentis 1. In an electric furnace for the distilla tion of zinc from its oresor by-products, the

combination of a mufi'le closed at one end and made of refractorymaterial which is a bad electric conductor, a Vessel closed at one endto contain the muliie and pivoted so that it can be rotated about ahorizontal axis and adapted to extend at its open end beyond the mouthof the minds, a condenser for zinc adapted to be connected to the mouthof the inuliie and to extend beyond the open end of the vessel, and amember to close the mouthof the vessel and having an opening throughwhich the condenser can pass for the purpose set forth.

2. In an electric furnace for the distillation of zinc from its ores orby-products, the

combination of a mutlie closed at one end and made of refractorymaterial which is abad electric conductor, a vessel closed at one end tocontain the mulfie and pivoted so that itcan berotated about ahorizontal axis and adapted to extend a segment of its circum ference atits open end beyond the mouth of the muffle, a cover to complete theunextended segment of Ms circumference, a con- In testimony whereof Ihave signed my denser for zinc adapted to be connected to name to thisspecification in the presence of the mouth of the mufile and to extendbetwo subscribing Witnesses.

yond the open end of the vessel, ii-11d amem- FRANCESCO SARTORI. her toclose the mouth of the vessel and hav- Witnesses: ing anopening throughwhich the condenser CARLO BELLYRAND,

ban pass for the purposeset forth. VINCENTO DE MASELLIS.

